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c/reconstitution·posted 20 days ago by u/freya_onwuka

does insulin syringe actually matter or is it forum lore at this point

Discussion Sourced ×4

Right, the units question again, but with numbers this time.

I have 23 data points over 4 weeks. The pattern is consistent enough that I do not think it is chance, and boring enough that nobody is going to screenshot it, which is usually a good sign.

The thing I would flag for anyone new: the effect I am describing showed up at week 84, not week 38. People give up long before the interesting part.

Interested in whether this matches other people's logs or whether I am an outlier.

212 up / 286 down43% upvoted16 commentsid 194ef39 Jul 2026

16 comments

16 in this archive, depth 4

best — the order this archive was captured in

u/marta_weiss11 points·19 days ago·edited

Yeah, showing the arithmetic is the fastest way for someone to spot the error.

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u/units_not_mgMOD6 points·19 days ago

This is an urgent-care question wearing a forum question's clothes. Please contact a clinician rather than waiting for replies.

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u/wanjiru_varga5 points·19 days ago

never post a calculation as advice without stating the concentration

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u/RetaAndRegret23 points·18 days ago

dosing errors come from people reconstituting two vials differently and forgetting which is which

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u/freya_onwukaOP3 points·18 days ago

never post a calculation as advice without stating the concentration

Adding to this: dead space is doing more work than the comment implies.

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u/freya_onwukaOP3 points·19 days ago

Not to be pedantic but insulin syringe and bacteriostatic water are being used interchangeably and they are not interchangeable in real life.

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u/lurker_for_years8 points·19 days ago

15mg vial, 2mL water, concentration is 15/2 — write it on the vial afterwards

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u/sofia_danquah6 points·18 days ago

dead space is real and the syringe matters

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u/niels_roos2 points·19 days ago

Disagree but this is the good kind of wrong — it is specific enough to be checked.

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u/rosa_mensah8 points·19 days ago·edited

dead space is real and the syringe matters

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u/karl_fischer_kev-6 points·19 days ago

dead space is real and the syringe matters

Disagree on that part. 97.9% and 97.6% on the same vial is normal.

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u/ilias_steiner1 point·19 days ago

This is correct. 1mL versus 6mL is the common mistake.

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u/RetaAndRegret28 points·20 days ago

Yeah, showing the arithmetic is the fastest way for someone to spot the error.

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u/ahmed_rasmussen0 points·20 days ago

Are you using a u-100 or u-40 syringe? That changes everything.

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u/andres_sorensen1 point·20 days ago

bacteriostatic and sterile water are not interchangeable, do not use them that way

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About c/reconstitution

The arithmetic and the technique. Bacteriostatic versus sterile water, reconstitution volume as a concentration choice, converting mg/mL into insulin-syringe units, dead space, swirl-not-shake, stopper coring, and how long a reconstituted vial is actually good for. Math errors get corrected fast and politely.

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